Stability order of the following resonating structure will be:

a)
I > II > III > IV
b)
II > I > III > IV
c)
III > II > I > IV
d)
I > III > II > IV
Correct answer is option 'A'. Can you explain this answer?

Question

Stability order of the following resonating structure will be:

a)
I > II > III > IV
b)
II > I > III > IV
c)
III > II > I > IV
d)
I > III > II > IV

Correct answer is option 'A'. Can you explain this answer?

Answer

Ist is uncharged so the most  stable among foolowing..2nd one is charged but have more no of covalent bond than 3rd and 4th so it is more stable  than 3rd and 4th now b/w 3rd and 4th  follow the electronegativity ruke which means more electronegative atom bears negative charge..in 4th the positive charge on oxygen atom against the electronegative prinicple ..as oxygen is a electronegative atom so it will like to have negative charge rather tha positive chargee..so 3rd is more stable tha 4th So order will be 1>2>3>4

Answer

First see 1,w/o charge 2nd most no pi bond third ,negtv charge on most electro- ve atom ,third charge seperation thrfor answer is 1

Answer

A is neutral with co bond
in b +ve charge on o decrease the stability
c no double bond present
in d +ve charge on o decrease stability

Answer

First we check  1) Non polar > polar 2) no. of double bond 3) more EN atom contain -ve  charge 4) opposite charge having less distance

Answer

Why 2nd is more stable than 3rd one! oxygen is an electronegative element having +ve charge..in structure 2

Answer

At first You have to see .. which structure has more no of double bond that is more stable, then you see conjugation

Answer

1st and 2nd both have 1-1π-bond but 1st one has no any charge than 1st is more stable than 2nd and after that 2nd one is more stable because it has at least 1 π bond and other options has no any π bond ..after that 3rd one is more stable because it can explain on the basis on (-) charge on most electronegative atom and other reasons I's formed (+) charge is stabilized by +M than 3rd one is more stable than 4th one.

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